The acid wash is meant to bring new life to an old pool. Over time, a pool can develop staining from many different elements in the water and environmental factors. Metal staining, copper and iron staining, organic matter in the water, and fertilizer staining call dull, shadow and streak on the pool finish. If the materials in the pool are integrally sound, the pool can be drained and bathed in muriatic acid. The will remove most of the staining and leave a brighter layer of the pool finish visible. The pool is re-filled with water. Customers are amazed at how great the pool can look. It’s important to have a professional evaluate the pool first to determine if the existing finish will hold up to the chemical treatment.